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Re: mariner 150 hp dies at high speed

First thought that comes to mind is something is causing no fuel to your motor.... Did you check for a collapsed bulb, is the tank vent clear, is your filter new? You may have some crud on the dip tube in your tank. Might be this ethanol stuff has ruined the inside of you fuel lines. Hope this helps...BF

Re: mariner 150 hp dies at high speed

I agree w/BF...Get someone to ride in the back and squeeze the ball when it starts to sputter. If it keeps running the fuel pump may have a small hole in the diaphragm and can't keep up with the fuel demand.

Fix minor things (replace wear items for preventative maintenance.) that cause major problems before they break.